I have an 89 Chevy truck 1500 TBI and it has a problem accelerating when it is cold. When I first crank it up and go, it hesitates and stumbles for a minute and then pick up speed. After it gets good and warmed up it doesn't do it anymore.

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ENGINE HESITATES WHILE ACCELERATIONLOSS OF ACCELERATIONIt can be fuel pressure issue or it's the problem with accelerator pedal or its clogged filters causing there.There are many other possibilities. I suggest you to go through the list of help links mentioned below, these will help you to confirm where the actual fault lies: -------Jerks and Hesitates During Acceleration?http://technoanswers.blogspot.in/2012/07/2004-dodge-town-country-jerks-and.html-----------Loss of acceleration?http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html---------Headlights flickering and car hesitates to start?http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html--------How exactly the Vehicles Accelerator Cable works?http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html------------- How exactly Vehicles Accelerator Pump Diaphragm Works?http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html--------2000 Toyota Avalon: Engine Lean Codes and Knock Sound on Acceleration?http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-engine-lean-codes.html---------2004 Toyota Avensis: Acceleration And Deceleration makes noise on Front End?http://whatisbyme.blogspot.in/2012/05/2004-toyota-avensis-acceleration-and.html---------Wheel hop under hard acceleration?http://technoanswers.blogspot.in/2012/04/wheel-hop-under-hard-acceleration.html--------2009 Chevy impala accelerator pedal sensor?http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html---------Nissan Pathfinder stalls and bucks on Acceleration?http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html--------Acceleration lag problem?http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html-------------These details will help.Thanks.

hesitation with TBI is sometimes a dirty Injector, make sure you have a good fan pattern on the injector and make sure its responcive. use a nylon wire brush to clean the tip, and alot of carb cleaner, also make sure that your butterfly moves freely, they tend to get gue/carbon build up on them and this will also cause a hesitation

have you checked the filter, i know you state the fuel lines are clear though. likely fuel injectors have lost flow. the TBI injectors can be cleaned, but i usually just replace them. but check them using a timing light hooked to the coil wire for timing of each injector spray. the pattern under the light should be even and conical shape, no major spatter. if one shows low volume, the other one should be replaced at same time, it will save you having to change it when you put brand new next to old one a have same problem again. only replace with brand new, i've had 7 bad remanufactured injectors on one truck at one point in time, only replace with new!